/ Dictionary / Index P plastral: Meaning and Definition of Find definitions for: plas•tral Pronunciation: (plas'trul), [key] — adj. Zool. of or pertaining to a plastron. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. plastotype plastron Related Content Daily Word Quiz: immense Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language